/*
 * Copyright (C) 2004-2010 NXP Software
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**********************************************************************************
   INCLUDE FILES
***********************************************************************************/

#include "VectorArithmetic.h"

/**********************************************************************************
   FUNCTION  From2iToMS_16x16
***********************************************************************************/

void From2iToMS_16x16( const LVM_INT16  *src,
                             LVM_INT16  *dstM,
                             LVM_INT16  *dstS,
                             LVM_INT16  n )
{
    LVM_INT32 temp1,left,right;
    LVM_INT16 ii;
    for (ii = n; ii != 0; ii--)
    {
        left = (LVM_INT32)*src;
        src++;

        right = (LVM_INT32)*src;
        src++;

        /* Compute M signal*/
        temp1 =  (left+right)>>1;
        *dstM = (LVM_INT16)temp1;
        dstM++;

        /* Compute S signal*/
        temp1 =  (left-right)>>1;
        *dstS = (LVM_INT16)temp1;
        dstS++;
    }

    return;
}
void From2iToMS_Float( const LVM_FLOAT  *src,
                             LVM_FLOAT  *dstM,
                             LVM_FLOAT  *dstS,
                             LVM_INT16  n )
{
    LVM_FLOAT temp1,left,right;
    LVM_INT16 ii;
    for (ii = n; ii != 0; ii--)
    {
        left = (LVM_FLOAT)*src;
        src++;

        right = (LVM_FLOAT)*src;
        src++;

        /* Compute M signal*/
        temp1 =  (left + right) / 2.0f;
        *dstM = (LVM_FLOAT)temp1;
        dstM++;

        /* Compute S signal*/
        temp1 =  (left - right) / 2.0f;
        *dstS = (LVM_FLOAT)temp1;
        dstS++;
    }

    return;
}
/**********************************************************************************/
